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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
The cause: Blue circles result from oxygenated blood pooled beneath the under-eye skin. Skin here is very thin and almost transparent, so blood shows through. This is more noticeable in the morning: When weâve been horizontal for a while, fluids accumulate and the veins expand to hold more blood.